7a+15=3a-9

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Solution for 7a+15=3a-9 equation: 



7a+15=3a-9

We move all terms to the left:

7a+15-(3a-9)=0

We get rid of parentheses

7a-3a+9+15=0

We add all the numbers together, and all the variables

4a+24=0

We move all terms containing a to the left, all other terms to the right

4a=-24

a=-24/4

a=-6

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